US4112353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for testing dielectric adequacy and for indicating physical defects in a nonconducting material by depositing traces of carbon on the material
Assignee: Westinghouse Electric Corp
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Filing: 1976-09-21
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Granted: 1978-09-05
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Expires: 1996-09-21
Abstract
Abstract An elastomer impregnated with carbon is utilized in conjunction with a conductor to test the dielectric adequacy of a nonconductor and to indicate physical defects, such as cracks, pinholes or a thickness below a predetermined minimum, by depositing traces of carbon on the nonconductor in the area of the defect or the area where the thickness is below the predetermined minimum.
Inventors
- 👤 Robert W. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:07
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/025; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/20; G01N27/205; G01R31/00; G01R31/12; G01R31/1227; G01R31/1263
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
105 words
A method for testing a personnel container for physical defects and dielectric adequacy, comprising the steps of: placing an ionic solution in the container; placing a first electrode in said solution; passing a second electrode having a wiper blade formed from an elastomer filled with conductive particulate material over the outer portion of said container which is filled with said ionic solution; imposing a predetermined DC voltage across said electrodes, and determining the location of a mark of smudge on said container, said particulate material in the elastomer leaving a mark outlining a defect or a smudge if the thickness is below some minimum value.
Claim 2
Independent Claim
105 words
A method for testing a personnel container for physical defects and dielectric adequacy, comprising the steps of: placing an ionic solution in the container; placing a first electrode in said solution; passing a second electrode having a wiper blade formed from an elastomer filled with conductive particulate material over the outer portion of said container which is filled with said ionic solution; imposing a predetermined DC voltage across said electrodes, and determining the location of a mark of smudge on said container, said particulate material in the elastomer leaving a mark outlining a defect or a smudge if the thickness is below some minimum value.
Claim 3
Dependent Claim
47 words
The method as set forth in claim 1, and further comprising the step of raising the container and passing the second electrode over the bottom of the container, whereby physical defects are made obvious by the deposition of particulate material on the surface of the nonconductive material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |